From my experience in the third world with quite poor infrastructure (e.g. unpaved roads, lack of traffic control devices anyone respects etc.), cars and motorcycles are still everywhere.
Some places like Ethiopia have simply switched to EVs by encouraging their import and discouraging import of non-EVs. Now, most vehicles there are EVs.
Yes. Which is exactly the problem. If cars cause traffic jams - never mind their other externalities only some of which are fixed by EVs - then that just means cars are too cheap and their true costs aren't reflected in their price. Cars are a classic tragedy of the commons, everyone in traffic would prefer that there be less traffic so they could get to places faster.